<!--单张图片上传组件-->
<template> 
  <div>
    <el-upload action="http://gulimall-hello-2021.oss-cn-beijing.aliyuncs.com" :data="dataObj" list-type="picture"
               :multiple="false" :show-file-list="showFileList" :file-list="fileList" :before-upload="beforeUpload"
               :on-remove="handleRemove" :on-success="handleUploadSuccess" :on-preview="handlePreview">
      <el-button size="small" type="primary">点击上传</el-button>
      <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过10MB</div>
    </el-upload>
    <el-dialog :visible.sync="dialogVisible">
      <img width="100%" :src="fileList[0].url" alt="">
    </el-dialog>
  </div>
</template>
<script>
  import {policy} from "./policy";
  import {getUUID} from "@/utils";

  export default {
    name: "singleUpload",
    props: {
      value: String,
    },
    computed: {
      imageUrl() {
        return this.value;
      },
      imageName() {
        if (this.value != null && this.value !== "") {
          return this.value.substr(this.value.lastIndexOf("/") + 1);
        } else {
          return null;
        }
      },
      fileList() {
        return [
          {
            name: this.imageName,
            url: this.imageUrl,
          },
        ];
      },
      showFileList: {
        get: function () {
          return (
            this.value !== null &&
            this.value !== "" &&
            this.value !== undefined
          );
        },
        set: function (newValue) {
        },
      },
    },
    data() {
      return {
        dataObj: {
          policy: "",
          signature: "",
          key: "",
          ossaccessKeyId: "",
          dir: "",
          host: "",
          // callback:'',
        },
        dialogVisible: false,
      };
    },
    methods: {
      emitInput(val) {
        this.$emit("input", val);
      },
      handleRemove(file, fileList) {
        this.emitInput("");
      },
      handlePreview(file) {
        this.dialogVisible = true;
      },
      beforeUpload(file) {
        let _self = this;
        return new Promise((resolve, reject) => {
          policy()
            .then((response) => {
              console.log('响应数据：', response.data)
              _self.dataObj.policy = response.data.policy;
              _self.dataObj.signature = response.data.signature;
              _self.dataObj.ossaccessKeyId = response.data.accessid;
              _self.dataObj.key =
                response.data.dir + getUUID() + "_${filename}";
              _self.dataObj.dir = response.data.dir;
              _self.dataObj.host = response.data.host;
              console.log('响应数据2222：', response.data)
              resolve(true);
            })
            .catch((err) => {
              reject(false);
            });
        });
      },
      handleUploadSuccess(res, file) {
        console.log("上传成功...");
        this.showFileList = true;
        this.fileList.pop();
        this.fileList.push({
          name: file.name,
          url:
            this.dataObj.host +
            "/" +
            this.dataObj.key.replace("${filename}", file.name),
        });
        this.emitInput(this.fileList[0].url);
      },
    },
  };
</script>
